I don't know why you're so so focussed on DH.
Yes they make a nice suit, with a slim fit, but it's just re-badged Caruso for about a third or double the price more.
I seriously think the Ralph Lauren shop on Bond St. would be the solution to your problems - you can try PRL and RLBL for the slimmer fit if you like. The quality for the price actually goes a long way with RL, unlike some of the other RTW makers you mention on your list.
Lastly you really need to stop...